学生成绩管理系统-java-版

//这个程序，可以完成基本的学生成绩管理，可以对学生增加，删除和按平均分排序等基本操作//希望下载的朋友们可以看懂，学到一点知识~~~

package Student;

public class Student {

private String id; // 学号

private String name; // 姓名

private int engl; // 英语成绩

private int math; // 数学成绩

private int comp; // 计算机成绩

private double aver; // 平均分

private Student students[]; // 学生

public static int size = 0; // 人数

Student() {

};

Student(String id, String name, int engl, int math, int comp) { size++;

this.id = id;

https://www.360docs.net/doc/6912308208.html, = name;

this.engl = engl;

this.math = math;

https://www.360docs.net/doc/6912308208.html,p = comp;

aver = average();

}

public Student(Student s) {

this.id = s.id;

https://www.360docs.net/doc/6912308208.html, = new String(https://www.360docs.net/doc/6912308208.html,);

this.engl = s.engl;

this.math = s.math;

https://www.360docs.net/doc/6912308208.html,p = https://www.360docs.net/doc/6912308208.html,p;

this.aver = s.average();

}

public void insertsort() { // 按平均分排序

Student temp = new Student();

for (int i = 0; i < size; i++)

for (int j = 0; j < size - i - 1; j++) {

if (students[j].aver > students[j + 1].aver) {

temp = students[j];

students[j] = students[j + 1];

students[j + 1] = temp;

}

}

}

public Student[] getStudents() {

return students;

}

public boolean addStudent(Student addstudent) { //增加学生// this.students=new Student[size];

boolean flag=false;

for(int i=0;i

if(addstudent.id.equals(students[i].id))

flag=true;

break;

}

if(flag==false)

{

students[size - 1] = addstudent;

return true;

}

else

return false;

}

public boolean subStudent(String id) { //按学号删除学生int i;

for (i = 0; i < size; i++) {

if (id.equals(students[i].id))

break;

else

return false;

}

int top = i;

for (int j = top + 1; j < size; j++) {

students[j - 1] = students[j];

}

size--;

return true;

}

public void setStudents(Student[] students) { this.students = new Student[100];

for (int i = 0; i < size; i++)

this.students[i] = new Student(students[i]); }

double average() {

return (engl + math + comp) / 3;

}

String getId() {

return id;

}

String getName() {

return name;

}

int getEnglish() {

return engl;

}

int getMath() {

return math;

}

int getComputer() {

return comp;

}

double getAverage() {

return aver;

}

int getSize() {

return size;

}

public void fanilize() {

size--;

}

public String toString() {

String s;

s = " "+ "学号"+ "\t"+ "姓名"+ "\t"+ "英语"+ "\t"+ "数学" + "\t"

+ "计算机" + "\t" + "平均分\n";

for (int i = 0; i < size; i++)

s = s + " "+ students[i].getId() + "\t"+ students[i].getName() + "\t " + students[i].getEnglish() + "\t"

+ students[i].getMath() + "\t" +

students[i].getComputer()

+ "\t" + students[i].getAverage() + "\n";

return s;

}

}

package Student;

import java.util.*;

public class textStudent {

/**

*@param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

// ArrayList students = new ArrayList();

/*

* Student students[]; students = new Student[5]; int i; for (i = 0;

i <

* 5; i++) { students[i] = new Student(getAStudent(i + 1)); } Student

* stu = new Student(); stu.setStudents(students);

* System.out.print(stu);

*

* System.out.print("增加学生"); Student student1[]=new

Student[i+1];

* for(int j=0;j<5;j++){ student1[j]=students[j]; }; student1[i]=new

* Student(getAStudent(i+1)); stu.setStudents(student1);

* System.out.println("添加成功");

*/

Student students[];

students = new Student[3];

int i;

for (i = 0; i < 3; i++) {

students[i] = new Student(getAStudent(i + 1));

}

Student stu = new Student();

stu.setStudents(students);

int n;

Scanner Keyboard = new Scanner(System.in);

//System.clear();

do {

menu();

System.out.println("请选择操作");

n = Keyboard.nextInt();

System.out.println("\n");

switch (n) {

case 1:

System.out.println("增加学生");

if(stu.addStudent(getAStudent(++i)))

System.out.print("\n添加成功");

else {

System.out.print("已经有此学号了，添加失败");

i--;

}

break;

case 2:

System.out.print("输入要删除的学生学号：");

String str=Keyboard.next();

if(stu.subStudent(str))

{

System.out.println("删除成功");

i--;

}

else{

System.out.print("没有找到,删除失败\\a");

}

break;

case 3:

System.out.println("所有学生的信息：" + "共" + Student.size + "人");

System.out.println(stu);

break;

case 4:

System.out.print("按平均分排序，");

stu.insertsort();

System.out.println("排序后的结果：");

System.out.print(stu);

break;

case 0:

System.out.println("成功退出");

break;

default:

System.out.println("输入错误，请从新输入");

break;

}

} while (n != 0);

}

static Student getAStudent(int i) {

Scanner Keyboard = new Scanner(System.in);

Student studenti;

System.out.println("输入第" + i + "个学生的信息:");

System.out.print("学号:");

String id = Keyboard.next();

System.out.print("姓名:");

String name = Keyboard.next();

System.out.print("英语成绩:");

int eng = Keyboard.nextInt();

System.out.print("数学成绩:");

int math = Keyboard.nextInt();

System.out.print("计算机成绩:");

int comp = Keyboard.nextInt();

studenti = new Student(id, name, eng, math, comp);

return studenti;

}

static void menu() {

System.out.println("\n");

System.out.println("1.增加学生");

System.out.println("2.删除学生");

System.out.println("3.显示所有学生的信息");

System.out.println("4.按平均分排序");

System.out.println("0.退出");

}

}